llvm: remove useless generator
llvm: remove useless generator

> When JITDylibs are searched during lookup, if no existing definition
> of a symbol is found, then any generators that have been added are run
> (in the order that they were added) to potentially generate a
> definition.

> Creates a DynamicLibrarySearchGenerator that searches for symbols in the current process.

We don't have to search the current process for symbols as we're not
really JITing, we're just using the wrong api to extract bpf code

iovisor/bpftrace,iovisor/bpftrace,iovisor/bpftrace,iovisor/bpftrace